const state = {
    visitedViews: [],
    cachedViews: [],
};

const mutations = {
    ADD_VISITED_VIEW: (state, view) => {
        if (state.visitedViews.some((v) => v.path === view.path)) return;
        state.visitedViews.push(
            {...view, title: view.meta.title || 'no-name'},
        );
    },
    ADD_CACHED_VIEW: (state, view) => {
        if (state.cachedViews.includes(view.name)) return;
        if (!view.meta.noCache) {
            state.cachedViews.push(view.name);
        }
    },

    DEL_VISITED_VIEW: (state, view) => {
        for (const [i, v] of state.visitedViews.entries()) {
            if (v.path === view.path) {
                state.visitedViews.splice(i, 1);
                break;
            }
        }
    },
    DEL_CACHED_VIEW: (state, view) => {
        const index = state.cachedViews.indexOf(view.name);
        index > -1 && state.cachedViews.splice(index, 1);
    },

    DEL_OTHERS_VISITED_VIEWS: (state, view) => {
        state.visitedViews = state.visitedViews.filter((v) => v.meta.affix || v.path === view.path);
    },
    DEL_OTHERS_CACHED_VIEWS: (state, view) => {
        const index = state.cachedViews.indexOf(view.name);
        if (index > -1) {
            state.cachedViews = state.cachedViews.slice(index, index + 1);
        } else {
            state.cachedViews = [];
        }
    },

    DEL_ALL_VISITED_VIEWS: (state) => {
        // keep affix tags
        const affixTags = state.visitedViews.filter((tag) => tag.meta.affix);
        state.visitedViews = affixTags;
    },
    DEL_ALL_CACHED_VIEWS: (state) => {
        state.cachedViews = [];
    },

    UPDATE_VISITED_VIEW: (state, view) => {
        for (let v of state.visitedViews) {
            if (v.path === view.path) {
                v = Object.assign(v, view);
                break;
            }
        }
    },

    DEL_RIGHT_VIEWS: (state, view) => {
        const index = state.visitedViews.findIndex((v) => v.path === view.path);
        if (index === -1) {
            return;
        }
        state.visitedViews = state.visitedViews.filter((item, idx) => {
            if (idx <= index || (item.meta && item.meta.affix)) {
                return true;
            }
            const i = state.cachedViews.indexOf(item.name);
            if (i > -1) {
                state.cachedViews.splice(i, 1);
            }
            return false;
        });
    },

    DEL_LEFT_VIEWS: (state, view) => {
        const index = state.visitedViews.findIndex((v) => v.path === view.path);
        if (index === -1) {
            return;
        }
        state.visitedViews = state.visitedViews.filter((item, idx) => {
            if (idx >= index || (item.meta && item.meta.affix)) {
                return true;
            }
            const i = state.cachedViews.indexOf(item.name);
            if (i > -1) {
                state.cachedViews.splice(i, 1);
            }
            return false;
        });
    },
};

const actions = {
    addView({dispatch}, view) {
        dispatch('addVisitedView', view);
        dispatch('addCachedView', view);
    },
    addVisitedView({commit}, view) {
        commit('ADD_VISITED_VIEW', view);
    },
    addCachedView({commit}, view) {
        commit('ADD_CACHED_VIEW', view);
    },

    delView({dispatch, state}, view) {
        return new Promise((resolve) => {
            dispatch('delVisitedView', view);
            dispatch('delCachedView', view);
            resolve({
                visitedViews: [...state.visitedViews],
                cachedViews: [...state.cachedViews],
            });
        });
    },
    delVisitedView({commit, state}, view) {
        return new Promise((resolve) => {
            commit('DEL_VISITED_VIEW', view);
            resolve([...state.visitedViews]);
        });
    },
    delCachedView({commit, state}, view) {
        return new Promise((resolve) => {
            commit('DEL_CACHED_VIEW', view);
            resolve([...state.cachedViews]);
        });
    },

    delOthersViews({dispatch, state}, view) {
        return new Promise((resolve) => {
            dispatch('delOthersVisitedViews', view);
            dispatch('delOthersCachedViews', view);
            resolve({
                visitedViews: [...state.visitedViews],
                cachedViews: [...state.cachedViews],
            });
        });
    },
    delOthersVisitedViews({commit, state}, view) {
        return new Promise((resolve) => {
            commit('DEL_OTHERS_VISITED_VIEWS', view);
            resolve([...state.visitedViews]);
        });
    },
    delOthersCachedViews({commit, state}, view) {
        return new Promise((resolve) => {
            commit('DEL_OTHERS_CACHED_VIEWS', view);
            resolve([...state.cachedViews]);
        });
    },

    delAllViews({dispatch, state}, view) {
        return new Promise((resolve) => {
            dispatch('delAllVisitedViews', view);
            dispatch('delAllCachedViews', view);
            resolve({
                visitedViews: [...state.visitedViews],
                cachedViews: [...state.cachedViews],
            });
        });
    },
    delAllVisitedViews({commit, state}) {
        return new Promise((resolve) => {
            commit('DEL_ALL_VISITED_VIEWS');
            resolve([...state.visitedViews]);
        });
    },
    delAllCachedViews({commit, state}) {
        return new Promise((resolve) => {
            commit('DEL_ALL_CACHED_VIEWS');
            resolve([...state.cachedViews]);
        });
    },

    updateVisitedView({commit}, view) {
        commit('UPDATE_VISITED_VIEW', view);
    },

    delRightTags({commit}, view) {
        return new Promise((resolve) => {
            commit('DEL_RIGHT_VIEWS', view);
            resolve([...state.visitedViews]);
        });
    },

    delLeftTags({commit}, view) {
        return new Promise((resolve) => {
            commit('DEL_LEFT_VIEWS', view);
            resolve([...state.visitedViews]);
        });
    },
};

export default {
    namespaced: true,
    state,
    mutations,
    actions,
};
